export class Base64Utils {
    static getImgToBase64(file) {//将图片转换为Base64
        return new Promise(resolve => {
            let reader = new FileReader();
            reader.onload = (ev => {
                let base64Str = ev.target.result;
                resolve(base64Str)
            })
            reader.readAsDataURL(file)
        })
    }

    static dataURLtoFile(dataurl, filename) {//将base64转换为文件
        let arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
            bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
        while (n--) {
            u8arr[n] = bstr.charCodeAt(n);
        }
        return new File([u8arr], filename, {type: mime});
    }
}
